B&K ST-140 vs ex-442 sound charactor

I currently have an st-140 (105 watt version) driving my Zu Omen Defs. I love the Tube like warmth and mellow presentation. I'm going to have the caps replaced. However, I have a chance on a one owner ex-442. Basically the same chasis and footprint as the 140, just with 200 watts ch. I really do not need extra power since the Omen Defs are extremely efficient. However, I was possibly thinking of purchasing the ex-442 and have Caps replaced and then just place it in my system since the amp has been pretty much papered by the one owner. I purchased my 140 used and not sure how many hands it has been in and it's a little "nicked" up. Just curious if there are any sound character differences between the two models?