All are the same design. Its just SMRTB itchy hand take out the
headlight covers of 1181L, 1182J, 1183G, 1186Z and the rest of
the Lance + Hinos + Merz that have Volgren body
For Volgren
Bendies
The side window glass height designs were also differrent.
TIB1024H, TIB1178Y - TIB1182J seems higher and TIB1183G - TIB1197S
seems like WAB bendies. 
Also to note, TIB1178Y - TIB1187X got 2 squarish black holders
to open the engine cover, while TIB1024H, TIB1188T - TIB1197S
don't have.
Last thing to note, TIB1024H and TIB1178Y are the only Volgren
Bendies that got lower SMRT livery than the others. Cos 1 is a demo
and the other is the first Volgren Bendy.