That is not true, SAS and SATA can use identical cables if it is the right SAS connector type. The difference is the voltage used, therefore SAS cables can be significantly longer than SATA cables which are limited to 3ft (6.5ft for eSATA)
Actually after a lot of research I found several variations to sas and sata with the external connectors different some of the time, and internal drives may or may not be directly interchangable.
My box has 2 sas 3 1/2 drives that use separate cables, power and data but use the standard sata connectors and plug into sas ports on the mb. My replacement 2 1/2 drive a Fuji #MAY2073 however uses a sas-29 aka sff-8482 which is a unified connector with power and data in one.
I found 2 variations on newegg, one had all negative feedback, the other had 1 posting staying it did what they needed to do, I ordered this one but it won't arrive until next week. For $6.99 not a huge gamble, however I do wonder why the cable has 2 data cables coming from it, possibly for dual port 600 gb/s transfer rate device.