Why not just buy a Gibson?
Not trolling, but what made you get the Heritage instead of the Gibson?
My first Heritage was a '98 H150 (I bought used), which was a special dealer order with Seymour Duncan 59's and tune-o-matic tail and bridge (Nashville type) instead of Schaller pups and hardware and jumbo frets. Heritage put some weird value pots in it (basically the same as Norlin era late 70's Les Pauls, 300k and 100k). I played it for almost 20 years like that. Eventually, I had to replace the output jack, so put in the excellent Dimarzio 30% taper pots at the same time (500k and 250k). Much better. Then I put Faber locking ABR bridge and locking lightweight aluminum stopbar. Then I put on a set of Gotoh SG301 locking tuners in place of the heavy Grovers. That shaved a significant weight off the guitar, 8.8lbs now, vs a bit over 9lbs. More balanced and comfortable now. The Faber stuff is great, and is more functional change than stylistic change. Locking hardware and tuners are awesome at string change.
Not long ago, I bought a virtually unplayed 2001 H535. It had the typical Schaller hardware and HRW pickups. I liked the Faber stuff so much I put it on the H535, along with a set of Gotoh SG301 tuners. (the Rotomatics had gotten stiff due to lack of use). I put the Faber inserts and bushings in and holy cow, did that ever bring the tone out! I was stunned how much difference that made to the 535. I just refretted it with the same Dunlop 6100 wire too. Turns out it had some of the worst factory fretwork I've ever seen. Explains why it was unplayed so long. But now, it's a forever guitar. I love it, hands down. I've compared it with a Collings I35LC with Throbaks (excellent guitar) and I am totally happy with my 535. I even put a CNC'd nylon nut on it, because they work so much better than bone.
I didn't mind the stock Schaller hardware, but I'm much more used to the conventional tune-o-matic when I play. Just more comfortable.
I also own a very killer Gibson, a Custom shop 60th anniversary 1960 Les Paul v2. It is a stunner of a Les Paul as well. I know what a great Gibson should be. (where I learned the value of Nylon 6/6 nuts - which were original on all the 'bursts from the 50's and 60's)
So I ask, why do you want to change your Heritages?
Are you:
Correcting something?
Changing something for practical purposed?
Changing something to suit your playing style as it evolves?
Changing something for aesthetic reasons?
But I would suggest if you want it to be a Gibson, find the Gibson you want and get that.
There are enough, minor, but important differences, that a Heritage isn't and never will be a Gibson. My H150 is never gonna be a Gibson Les Paul, and my H535 is never gonna be a Gibson ES335, but that's OK.