feigao 540c xl the same as the purple can?

[tashpop]

i need to get a new motor since my other was no good from the factory. i told the place i bought it from that i opened it up to see if there was some debre inside causing the problems and he said that i voided the warrenty by opening the motor, although you can't tell. any ways, i found a good price on a 540c 7xl and i'm wondering if it'll bolt right up where my 540 10L was setting. i have plenty of room for a longer motor. is the quality better or the same also. big difference i see is the 540c has a built on heatsink.