Looks like the same variations in the Mohegan Sun Momentum slot cards are also true for the Momentum style Reserved Parking Cards (blue and orange found so far) with similar expiration dates for each issue so far on those found.

I've found a blue parking card in the 17th issue, an orange parking card in the 20th issue and a blue parking card in the 22nd issue

If anyone finds any other variations of the parking cards please send scans so we can get them added in the guides.