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It "shouldn't" be a problem with hard wired O2sims as I guess you are using. The ECU will trow a code if the downstrem O2 sensors reports out-of-normal-value for a car with catted DP's, which it will do without O2 sims on a uncatted engine. The O2 sensor report is simply adjusted by O2 sims to fall within approved values.
But, there may be other identifiers in the new software that not is handled by the VTECH flash, check with them if they can guaratee compability with their tune vs. 35.4.
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