She does look like a Welsummer in the new pictures--thanks for posting.
There are different lines of Welsummers from different breeders. I had one several years ago that was more boxy-looking. She passed and I had to get a replacement. The new one came from a bin with two different colors one slightly lighter. At the time I looked it up and I found some posts that said they can come in a silver duckwing color too. I got the more traditional color and this one is definitely more brown and less red than my first one and she is also a lighter weight and more rangy-looking bird, almost like she has some American Gamefowl way back in her line. My point is that they could both be Welsummers from two different strains.
There are different lines of Welsummers from different breeders. I had one several years ago that was more boxy-looking. She passed and I had to get a replacement. The new one came from a bin with two different colors one slightly lighter. At the time I looked it up and I found some posts that said they can come in a silver duckwing color too. I got the more traditional color and this one is definitely more brown and less red than my first one and she is also a lighter weight and more rangy-looking bird, almost like she has some American Gamefowl way back in her line. My point is that they could both be Welsummers from two different strains.