At first it appeared to me that they cannot be the same Sherman due to the apparent different location of the handle on the turret:
but after closer examination of my Sherman resources, which are not exhaustive but I do have the original version of Hunnicut's book on the Sherman, I have been unable to find a single photo of a Sherman VC, nor any other Sherman, that had a grab handle on the front right top corner of the turret, as the RN 175 Firefly appears to have. I am 99% sure that it is just a matter of perspective and that the grab handle is actually centrally-located, as on "Blondie". I will continue to look through my Sherman resources because there were myriads of detail changes and differences based on the time and location of manufacture of Shermans.
thanks for your work on this, Mike.
Sam Wren
Abilene, República de Texas
"Nosotros la gente que les dimos autoridad, igual, se lo podemos quitar" Ozomatli