it's a mix of bayonet and wedge.

Stern used to have the manual for the LE in PDF format on their website, which had the GI layout broken down by red/white/blue. The LE has separate GI lighting effects for red and blue. Red GI turns on in villain selection, for example. on the pro, there's no distinction.

you definitely need to replace the magneto flashers (spotlight and figurine) with higher voltage LEDs as the ones they recommend in the manual burn out quickly.

Not sure about the Pro but the LE has 44s in the in/out lane guides. The rest are 555s. I would think the pros were similar.

Yep the PRO has 44s in the in/outlane guides (4) and the back panel (6). All of the rest of the bulbs in the GI are 555.
I used the same bulbs as the LE in my PRO (cointaker double LEDS) in red white and blue just like the LE color map and it looks awesome. Too bad its not controllable like the LE, but its still a BIG improvement over the plain white bulbs.

Forgot about the backboard lamps.