Thanks for reaching out to us! Your Pella casement window locking handle resembles the 38-274 Pella Casement Lock Handle. The right handed side is part 38-275. This handle is used with the 38-284 Pella Casement Strike. Although, since they are so different in style, I am not confident that these would work as a suitable replacement. Unfortunately, we do not have any similar replacement for the latch hook installed above the lock handle.
That said, I believe your best bet would be to reach out to Pella directly. They may be able to supply you with the replacements you need or guide you in the right direction to obtain them.
I do apologize that we could not be of help with your repairs but please feel free to reach out with any other hardware repair projects you might have!