The flipper coils are different values.. because that's the way the game was made. The 11629 is the next step 'stronger' than the 15411. I guess the right flipper needed to be a little hotter than the left one, for whatever reason. Maybe it needs more oomph to hit the shots?
WMS had more than one company screening cabinets for them. There's a good writeup here:
http://www.flippers.be/pinball_cabinets.htmlI've had Creature and BSD both twice, one of each had playfields screened by Lenc Smith, and the other of each had playfields screened by Sun Process. WMS used both companies to screen playfields and cabinets, so perhaps each one used slightly different processes?
I've also seen both games with metal and wooden side rails. I's a lot more common to see the metal ones on BSD and the wooden ones on Creature, but both games were made with both styles. Personally, I prefer the wood. The problem with the metal is when the ball wears on it - how are you going to touch it up and get that pattern back? It took 3 sets of siderails from BSDs to get a pair that looked decent enough to put on my game. If the wooden ones need repainted, grab a spray can.
