Joey,
I've had a look at my K&C figure and the "similar" NMA one on your images (plus the ones I took at London) and yes they are a similar pose. However, I asked an independent assessor ( my Wife, who firstly said "What's a Sturmtiger" and secondly "Oh, I suppose we going to have that one next then?") and she said that the pose is similar but the sculpting is different (certainly different sculptor). She's the artist/craftlady after all.
I remember the slating NMA SdKfz received a few months ago, and couldn't believe the venom directed towards it, after all if you model a Tiger, its going to look like a Tiger and therefore should be similar to other people's Tiger. I also remember the furore about NMA's prototype Infantry squad which had a standing rifleman firing, and guess what K&C already had one and everyone said it was a copy. How many variations of a standing rifleman firing can there be? Take away the odd bit of equipment and there might be the odd difference but if NMA's research is as good as K&Cs then they are going to very much alike.
So going back to the initial question, yes they are similar but in the same way as any figure from any company could be. Just because one company puts out a figure sitting with leg up and looking through binos, then why shouldn't another? As long as they are not copies, and you can tell this is not a copy then so what? After all, in the end you don't have to buy this figure. ( I'm not by the way I'm buying the other Sturmtiger).
I suppose Mike or Blake are now going to tell me that it is the same figure from the same sculptor. At least then I'll be able to prove the missus wrong for the first time. But, I doubt it.
What am I buying next? The other NMA Sturmtiger, K&C Meyer's Halftrack and Kubelwagon, and the Honour Bound Winter Panther followed by Britains WWI Brits and Civil War. I love choice.
Best Wishes
Andy