Lt133 and Lt 155 Deck Etc.

I have had an LT133 for the past few years. I just purchased two LT155 mowers off craigslist. One is running, one is for parts. Are the decks the same on the LT133 and LT155? What parts are interchangeable between the two mowers? Are the Belts the same? Any help appreciated. What should I check out on the mower to make sure it is in good shape to run? I checked the oil, inflated tires and mowed some today. The deck on the good mower has a rust hole. The other deck looks solid. Both decks look like the wheels were welded back on. I'm hard on mowers that's why i'm buying used.

Thanks

Matthew