Doesn't say what year e90. Or what the stock power is of the 320d. It is very possible if it is a 135kw or 130kw stock 320d with software it can easily reach 170kw. And the 330d is a convertible which is alot heavier. Considering the above and the fact the 3 litre Is heavier. It is quite possible.
A modded Pre LCI beating a modded LCI? I'm not so sure about that.
Sticking to the OP I do think it is possible for a modded 320d to hand it to a stock 330d (both pre lci). The LCI's are significantly faster than the pre- and not to mention the F30's are flying.