rear tub

hi guys is the rear tub for 90's all the same size and fittings ?? including series 3 ?? just wondering as I seen in this month mag of landrovers about a hybrid using all discovery axles and engine and gearboc and etc etc 200tdi on a defender chassis and defender body but I checked with marslands chassis they said defender 200 tdi chassis is for a td5 rear tub

can any of u enlighten me ?? thanks:welcome2:

All 90 tubs more or less the same[some fixing and bracketry changes and fuel filler position] series different bulkhead and wheel arch position.