Just noticed this thread, better late than never!
For some reason, a few EL-XXX carts hit the market back in 1997. There is EL-001 Fifa 97 (with JY-060 printed on the PCB), EL-002 Tiny Toon 6 (PCB has JY-115 printed on it, label can be seen on BGW), EL-032 (possibly?), EL-033 and a few others.
They all share the exact same PCB with their JY counterpart release. (except EL-001 which doesn't seem to exist under a JY id). I doubt there is any particular meaning behind those EL-xxx release, like the SC-XXX cartridges (which is yet another id used by J.Y. Company).
EDIT: many JY carts manufactured from September 97 until September 98 have EL associated with the PCB manufacture date (later PCB lack those PCB date code and have the cartridge ID on them, such as SC-112, etc.)
Also huh, could SC stand for Super Cassette :somari: ?