Hmm.
Place I fly reckons you're current if you've flown within the last 21 days apparently regardless of type.
So one day I booked a plane, was asked whether I was current, said "yes, I did several hours in floatplanes a couple of weeks ago", and was authorised to fly.
Now, whilst the crosswind landing that followed was not my worst ever, it was some considerable way away from being my best, having most recently had the luxury of working out where the wind was coming from and just landing into it. Possibly regarding floatplane time as keeping myself current for landplanes was not a good decision - I'll think twice before trying that one on again.