Lots of people have come to this site wondering about missing remote controls. I know that some Tyco remotes will control vehicles other than what they were made for, but this isn't always the case. Since there were two frequencies for the early Tyco vehicles, I think the main thing would be to find the right frequency for what you have. Another option is to upgrade the transmitter and receiver to "hobby grade," which would open your options to more frequencies anyway.
Best of luck to you in your search. I hope you come back and let us know what you discover in the process.