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A tale of two Hiwatts

Id like your opinion on 2 very different sounding vintage Hiwatts:

Bout a year ago I plugged my P bass into a hylight era Dr103 and instantly knew it was the tone I'd been looking for all along....
I fought tooth and nail and managed to buy that very amp from the guitar player in my band ( 100w was too loud for him to push in order to get the most of the head in most clubs we play, so I found a 50w version locally and bought it so we could swap)

Being so blown away by the head I kept looking for a 200w version, the dr201, and eventually found one on eBay, INSANELY cheap, seller saying amp wouldn't turn on.

I took a gamble hoping he didn't know anything about amps, that maybe it just needed a fuse or just had a broken connection somewhere in the amp.

I took it to my tech who found a few minor issues, disabled a mod, reverted the amp back to stock, all fresh tubes, and told me I'd found the score of the century.

BUT, while the amp has had zero issues since then, it just doesn't have the same magic as the 100w head, not even close...

While the 100w sounds rich, full, and lush with gain pushed, amazing dynamics and grit, the 200w sounds pretty sterile, dry, and not as responsive.

I keep going back to the 100 even though I could really use the extra 100w for some gigs.

The power tubes are similar in both, the preamp tubes are NOS telefunken in 200w, new mullard 12ax7 in V1 of the 100w.

Any ideas what could be making such a difference in sound? I know every amp will have its own characteristics, but to have such a difference between two Amps from same era, company, with nearly identical gain stages seems strange.

I'd love to get some suggestion in what I could try to improve the tone of the 200w beast.
 
I don't really have much to add as the only hiwatts-like amps I own are clones (a DR103-based pre into a low watt power amp that I built and a DR201-based "boutique" amp) but the two versions I do have sound fairly similar to me. People seem to favor the KT88 power amp but the preamps are the same are they not? As @Bassmec mentioned how was the bias set? Power tubes new or old? Proper 12AT7 PIs? Assuming the amp had a cap job and power supply voltages are all reading right? When you said the tech restored the preamp to stock what were the mods done that they removed?
 
I had a Sound City 100 watt tube bass head. Similar design and time frame of the hiWatt. I liked it a lot. It was stolen by someone or ones who didn't know what they were doing (they didn't touch the modern, high dollar stuff).
 
Different transformers??
Barring that effect, my guess would be that you're able to push the 103's power section a little harder, which is really what it's all about. FWIW, I've owned three different DR103s over the years, and my current one ('72) sounds the best. Even when I had two serviced to the same specs at the same time by the same tech, this one sounded better. Sometimes one is just superior.