I remember that the Tupolev Tu-334K was also called the Tu-336, just as the Tu-204K cryogenic plane was referred to as Tu-206.And here are some more Tupolev cryogenic designs, originally posted at Whatifmodelers forum:
The first is what seems to be a LNG/LH2 powered variant of the Tu-334 medium-range airliner.
Second is the Tu-330K LNG fuelled version of the Tu-330 medium freighter. Called Tu-338 in Brassey's.
Last is Tupolev C-Prop, though the original image was captioned Tu-136. It is a light passenger or cargo transport using LNG fuel. Two Pratt & Whitney Canada PT6A-67 turboprops, 2,400 kg of LNG fuel, 3,400 kg of cargo.
Brassey's World Aircraft & Systems Directory 1996/97