Maybe your not aware of this but there were 42, Do-335 completed and 21 uncompleted before the war ended.
View attachment 71935
A Do 335A-1 serving with Erprobungskommando 335 (The only semi-operational unit with this aircraft)
There was only 1 production prototype Ho-229 made.
Here are the numbers I dug up. Are they matching to your source?
Do 335 Production List
Do 335V series prototypes, 14 aircraft built at Friedrichshafen,
mid 1943 to mid 1944, and tested at Mengen.
Model Code Werk Nr. Notes
Do 335V-1 CP+UA 230001 1st prototype. DB603A-1 engines.
FF 28.10.43
Do 335V-2 CP+UB 230002 to Rechlin, rear engine caught fire,
w/o 15.04.44
Do 335V-3 CP+UC/T9+ZH 230003 A-4 prototype, to Ob.d.L.
Do 335V-4 CP+UD 230004 Do 435 prototype, not completed
Do 335V-5 CP+UE 230005 1st with armament fitted, A-2 engines
Do 335V-6 CP+UF 230006 Dornier development a/c, hit by bomb
Do 335V-7 CP+UG 230007 Junkers Jumo 213A & E testbed, Dessau
Do 335V-8 CP+UH 230008 Daimler-Benz DB603E-1 testbed, Stuttgart
Do 335V-9 CP+UI/V9 230009 A-0 prototype, to Rechlin May 1944
Do 335V-10 CP+UK 230010 A-6 prototype night ftr with SN-2 radar
Do 335V-11 CP+UL/11 230011 A-10 prototype trainer
Do 335V-12 CP+UM 230012 A-12 prototype trainer
Do 335V-13 RP+UA/13 230013 B-1 prototype, to France for tests
Do 335V-14 RP+UB/14 230014 B-2 prototype, destroyed
Do 335A-0 pre-production batch, 10 aircraft built at Oberpfaffenhofen
July-Oct 1944.
One example converted to A-4 standard.
Model Code Werk Nr. Notes
Do 335A-0 VG+PG/101 240101 DB603A-2 engines, at Rechlin July 1944
Do 335A-0 VG+PH/102 240102 sole survivor, to USAAF as FE 1012,
now at NASM
Do 335A-0 VG+PI/103 240103 to Ob.d.L. late July 1944
Do 335A-0 VG+IJ/104 240104 to Erkdo 335 Sept 1944
Do 335A-0 VG+IK/105 240105 to Erkdo 335 captured by
US at Lechfeld 4.45
Do 335A-0 VG+PL/106 240106 to Erkdo 335
Do 335A-0 VG+PM/107 240107 to Erkdo 335
Do 335A-0 VG+PN/108 240108 to Erkdo 335
Do 335A-0 VG+PO/109 240109 to Erkdo 335
Do 335A-0 VG+PP/110 240110 to Erkdo 335 Oct 1944
Do 335A-1 production batch. 11 aircraft built at Oberpfaffenhofen,
plus 9 aircraft part assembled, Nov-April 1945.
Model Code Werk Nr. Notes
Do 335A-1 113 240113 Captured by US
Do 335A-1 240161 Captured by US
Do 335A-1 240162 Captured by US
Do 335A-1 240163 Captured by US
Do 335A-1 240164 Captured by US
Do 335A-1 240165 Captured by US
Do 335A-1 240166 Captured by US
Do 335A-1 240167 Captured by US
Do 335A-1 240168 Captured by US
Do 335A-1 240169 Captured by US
Do 335A-1 240170 Captured by US
Do 335A-1 01 240301 Partly assembled Captured by US
Do 335A-1 02 240302 Partly assembled Captured by US
Do 335A-1 03 240303 Partly assembled Captured by US
Do 335A-1 04 240304 Partly assembled Captured by US
Do 335A-1 05 240305 Partly assembled Captured by US
Do 335A-1 06 240306 Partly assembled Captured by US
Do 335A-1 07 240307 Partly assembled Captured by US
Do 335A-1 08 240308 Partly assembled Captured by US
Do 335A-1 09 240309 Partly assembled Captured by US
Do 335A-2 project only
Do 335A-3 project only
Do 335A-4 10 aircraft scheduled Jan-Feb 1945, only 4 part assembled at
Oberpfaffenhofen.
Model Code Werk Nr. Notes
Do 335A-4 10 240310 Partly assembled Captured by US
Do 335A-4 11 240311 Partly assembled Captured by US
Do 335A-4 12 240312 Partly assembled Captured by US
Do 335A-4 13 240313 Partly assembled Captured by US
Do 335A-6 none assembled, Heinkel Vienna factory bombed out.
Do 335A-10 aircraft built at Oberpfaffenhofen.
Model Code Werk Nr. Notes
Do 335A-10 111 240111 flew late Nov 1944. Captured by US at Oberpf.
Do 335A-10 240114 not completed
Do 335A-12. 2 aircraft built at Oberpfaffenhofen, plus 2 aircraft part assembled.
Model Code Werk Nr. Notes
Do 335A-12 112 240112 Air Min 225, to RAE, w/o 18 Jan 1946
Do 335A-12 121 240121 to England, w/o 13 Dec 1945
Do 335A-12 122 240122 not completed, scrapped by US
Do 335A-12 Partly assembled
Do 335B series prototypes. 6 aircraft part assembled at Oberpfaffenhofen.
Model Code Werk Nr. Notes
Do 335B-2 RP+UB 14/18 240118 B-2 replacement proto, to France
with CEV until 4.6.48
Do 335V-15 RP+UC 15/19 240119 B-1 2nd prototype to Lwe 2.45
Do 335V-16 RP+UD 16/20 240120 B-2 2nd prototype night ftr with FuG 218
Do 335V-17 RP+UE 17/16 240116 B-6 prototype to France w/o Autumn 45
Do 335V-18 RP+UF 18/17 240117 B-6 2nd prototype night ftr to Lwe 2.45
Do 335V-19 RP+UG 19/15 240115 B-3 prototype not completed
Do 335V-20 B-7 prototype not completed
Do 335V-21 B-8 prototype not completed
Do 335V-22 B-8 2nd prototype not completed