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The LS1b 512kb PCMs are interchangeable with the proper operating system flashed into them. If it is a 610 PCM and has had a "Full Flash" flashed into it from a 2002 WS6. Then it should read out as a 12200411 PCM with a 12212156 Operating system. If you wanted a 2002 WS6 tune, then you should be good to go.
Jeff
Jeff