I've got it to work! (to some extent)
I did the following:
1) Open up minecraft and created a minecraft amplified server.
2) Copied to world file to a new tekkit server and replaced the tekkit world folder.
The chunks that were transferred from the Minecraft server crossed over. (Although as HeatHunter said, ores from mods were missing)
However, when I travelled out and generated new chunks, they were generated as tekkit chunks.
So I now have a few chunks at the center of my map that are amplified! Gonna build my base here! And explore outwards for the ores etc.
Thanks for replying btw!