Probably its best to re-do the project. The hardware is quite different, so its difficult to reuse anything accessing the hardware. You can reuse anything, though (like calculation algorithms).
Thank you hli..
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PSoC1s are focussed on analog processing while PSoC5 or PSoC4 are more digitally oriented. (Skip the PSoC3, the CPU of 4 and 5 are much better). The PSoC5 dilter block is a digital filter and the OpAmps are not as flexible as in the PSoC1.