It’s reasonable to wonder if these games are essentially the same thing, as both have quite a few things in common. They’re both played on the single zero wheel, use French rules, and have live croupiers accompanying the action. More uniquely, between one and five random numbers are drawn in both games, and each has a random multiplier as well.
The only real difference is then visual, in how these lucky numbers and multipliers appear. In Lightning Roulette lit up (as in lightning struck), while in Mega Roulette, displayed in the background.
Also, they’re each from their own leading developer; Lightning Roulette (the predecessor) being an Evolution Gaming entity, and Mega Roulette Pragmatic Play’s answer to that successful title.