There is no real vb4 alternating colors as stated so you must be using a custom theme. If there is no standard in theme making it will be very hard to match themes just my opinion there. vb3 had uniform style declarations whereas vb4 may or may not. I know when I wrote integrations with vb4 there was no custom themes yet just the default theme which is shown below Reeftalk Forums
To not have extra fields required which most customers want you need to edit your uploadproduct templates and say remove this code
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As far as styles I am style looking at the default style to see what scheme change I can come up with.