Dometic Sealand 110 Toilet

I own a 2007 26' Springdale TT that came with a Dometic Sealand Traveler Lite 110 toilet that has been giving problems for the past 3 years, so decided to replace it. In checking with my local RV dealer and online I see that the 110 model has been replaced with the 310 series. Since the bathroom in the Springdale is very very tight I need to be sure that the specs of the 310 (drain hole placement, bolt hole placement etc) are the same as the 110. I tried another toilet model that said the specs were the same as the 110 but the design of the toilet was such that when installed there was more space between the back of the toilet and the wall (which was fine) but this moved the front closer to the tub which caused real knee problems. Had to return this toilet. Has anyone had experience replacing the Dometic Sealand 110 with the 310 model? Thanks for any info.