Quoted from jamieflowers:They are not interchangeable, you need a specific one for Spike...and if I remember correctly Stern will only warranty a factory shaker for Spike Games.
Stern service bulletin #184 doesn't address using a Rev B shaker on a Spike game, or using a Rev C shaker on a SAM game. It addresses using a non-Stern shaker on a Spike game - "Use of anything else other than an authorized Stern Pinball OEM shaker motor assembly on a SPIKE equipped game could damage the game’s cabinet node board and will void your game’s warranty". So I'm still curious to know if the actual shakers are identical between Rev B and Rev C, perhaps with some wiring harness change ??, and of course for use on a SAM system you'd need the Stern Shaker Motor Interface Board. Another way to ask the question:
Could you order a Rev C kit and use it on a SAM system if you already have a Stern Shaker Motor Interface Board?
Could you order a Rev B kit and use it on a Spike system (just don't use the Stern Shaker Motor Interface Board)?