Hi Jim,
I have the Boardman CX, and like you I also have the Team Carbon. I can therefore give you some info on the CX but not the Tricross.
I'm not sure what gruppo comes on the Tricross, but the SRAM Apex is great (especially for touring with the big range) and will be consistent with the SRAM on your TC. I have both bikes in Large, but for some reason the CX has wider handlebars. It means switching between bikes is more noticeable, but I actually quite like the extra sturdiness when laden that the wider bars give, and then I also like how much more compact and sporty I feel when on the TC. I'm sure you could switch no problem, although thinking about it now, I guess you do need a bit of extra width for the additional brake levers if you still want to mount lights etc.
Disc brakes take a while to bed in, and mine need resetting now for a second time about 1500 miles in as they've got a bit squidgy. They also honk a bit especially in the wet, but this is probably the set up and can be altered.
SkS Chromoplastic guards and the Tubus Vega rack look nice on it, and I opted for the Schwalbe Marathon tyres. I have photos if you want to have a look.
Took me around Ireland without any problems, carrying a LOT of kit, and gets me to work and the pub without incident. Getting home from the pub is a different matter entirely
Give me a shout if you have any more specific questions.