I'm thinking they are, and even use vectored graphics! It still puzzles me though, as to why I've never heard of LSL5 EGA. Maybe it was a standard form that came with the games that no one filled in, so it's very rare, or maybe they jsut threw it in all games and not all had EGA versions? Who knows!
If infact they did have seperate EGA versions of SQ1 VGA and LSL5, that are more than just different drivers, I think it's pretty odd that they would put all the effort into it yet not widely distribute it. The reality is, how many people with EGA cards were going to fork out $59.95 for a game that says "VGA only" on the box, says nothing about a mail-in EGA version, and just assume there is a coupon inside!? Beats me!
The reason Sierra did King's Quest 4 in AGI and SCI was not because it was created during a transition--that would be a terrible waste of time and money! It's because King's Quest 4 was their debut SCI title to showcase their new hi-res engine, but since computers like the Apple didn't support SCI, they had to use something else to support them, and AGI was the easiest route to take. If it weren't for the older computers like the Apple II which they still supported, I doubt they have done it in AGI as well at all. It came out back in the day when it was common for companies to make a game for The PC, Amiga, C64, Atari ST, Spectrum, Apple, and Mac! It was just part of the business to support them all, everyone had to do it if they wanted to reach a wide audience. That's the prime reason they have AGI and SCI--so they don't need to recreate each game for each platform.