What hardware preamp was the AP-66 modeled after?

The AP-66 is modeled after a vintage Neve 1066 with “round-can” Marinair input transformer. Does this version of the input transformer sound “better” than the later rectangular version in the 1073? We’re not making any claims here, but we tried a few different modules (1066s, 1073s) and we chose this one to model.