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Teeth!
The BDP-11 have ten teeth and the BDP-12 have eleven: see description for compatibility.
SJS have Tacx T4090 but some sources list them as being 10 speed, no mention of 11.
The Tacx website just lists compatible groupsets (no mention of speed) so you'll need to compare with your current wheels.
Difference between these other than price?
Need some Sram 11 speed jockey wheels. Wet weather mainly so something fairly durable and will stay smooth for a long time
Wiggle don't do tacx any more but these look alright
http://www.wiggle.co.uk/bbb-bdp-11-rollerboys-ceramic-jockey-wheels/
http://www.wiggle.co.uk/bbb-bdp-12-rollerboys-ceramic-jockey-wheels/