I tend to stay within caliber groups,yes I have a 45 and yes i have a weapon that fires 9mm. But for me my main stay is 40cal. This then tends to produce generically weapons trigger pulls in the same range, before I make whatever are personal choice adjustments.
When firing to the trigger break, if on a new weapon and I miss the break,I am still not at a full trigger pull,so I still have an advantage tactically. Due to my personal weapons selection the 45 is a third level backup, the 9 mm is a completely different style of weapon(mpx style) so there is no training confusion,admittedly my main base is ELT ( 1500-2000)(338-50)so thinking may be a bit different than some however if you are consistent in caliber,then by a few manufacturer’s pull weights are similar. if training for a performance level , that’s one thing, if collecting then that is something else and it wouldn’t matter,if its a love thing that’s entirely different, so the question is what is your purpose? Competition,work,love,just the fun of it,or owning the latest and greatest? This will all enter into how you train and carry, but regardless of how good you are,the best gun fight is the one that never happened. weapons life style is just a better form of golf,with better perks and more testing and better preparedness. Lol hope this is helpful.