Can I have 4 Unit Energy {G}{R}{W} and 4 Unit Energy {L}{P}{M} in my deck?
Yes, you can. The symbols {G}{R}{W} and {L}{P}{M} are part of the name of the card, so they are counted as different cards. When adding Unit Energy cards to a decklist, be sure to include the symbols as part of the card name on your list; you may list them as "Unit Energy GRW" and "Unit Energy LPM".
Source: Ultra Prism FAQ (2018-01-19), TPCi Rules Team (2018-02-01)