The latest firmwares was more about making a few more envelope tweaks for more snappy envelopes curves and bugfixes but the abrupt ending of the envelope release is still the same as on the prophet 600.
It is a great Synth and it is a nobrainer for the low prices they go for now.
The Pro 1 is closer to a mono prophet 5 and the Pro 800 is a Prophet 600 clone so they will never be the same.
There are many 80s synths that uses the same cem chips and still they are voiced and tweaked differently.