My Glock universe is presently 6 (2 G3 34s. 2 G3 35s. 1 G1 17 and 1 G2 19). All of them have the OEM - connector with a 5.5 TRS. They all feel roughly the same though the two guns with the most rounds thru them (the training 35 and 34) are a bit smoother and lighter. On both the G1 17 and the G2 19, I had to mix and match a bit with connectors until they all felt close.
I am told in the early Glock Team Sevigny days, they would test fire fire control parts until they got an extra set on the gun they liked.They would bag said set(s) up and should a gun break something, they would remove out the offending part and all others and swap in the "matched" set to duplicate the feel of the trigger to the extent such can even be done with a gun like a Glock given its tolerances.
Bottom line- Glocks can have trigger feel difs, both inter and intra generational on otherwise identical guns. This opinion is shared by the staff of a KC Metro Police Training Academy where the range master would concur based on firing literally thousands of pistols since the area departments went all in on Glock 15 ish years ago.
Dry Fire. Live Fire. Grease/Lube and go. If trigger feel is really driving the train, perhaps the Glock is not your platform because no remotely safe Glock trigger, imho, is going to hold a candle to any decent SA trigger.