Differences between Y88 Mk1 and 2 are minor. Mk2 has the cabin bulkhead 100ish mm further aft giving slightly larger galley area and better access to port quarter berth. Both come with various interior layouts, in particular the rear quarter berths, single/double can be found. Most will have the aft galley, this is desirable moreso that forward. Mk2 has an non slip that is factory done at time of build out of the mould, its a plus to some, negative to others, me personally didn't like it as it is harder to sit on and ironically, more slippery when wet.
You will always have a supply of dece