33 & 34 hoods are very similar and can be exchanged so long as you use the same year grill...(unless you want to customize it to fit). The cowls are the same so no worry there.

The 33 grill is thinner thus the hood and sides are different than the much thicker 34 units. Lots of guys have customized 33s by adding 34 sides because they wanted dual latches as you mention. But this is not for the meek if you plan to keep your 33 grill.

If you want a 34 hood/sides, you will want use a 34 grill, hood, and sides to keep it simple. Otherwise you will have to perform surgery to the front edge of the hood and hood sides to make them fit your 33 grill.

Personally I like both 33 & 34 hoods/sides/grills. I think the 33 is more elegant due to its curve and thin design while the 34 has a more bold classic design due to its straight and thicker grill.

Have fun!

Troy