Is the timing belt kit the same for a 560sec and 500sec

First of all there is no belt, but a chain...

The answer was given in your other thread - get access to the EPC and find the part number for your VIN. That's the only way you're going to know.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)