The 302 ports are similar in shape to the 308's, ie, an improvement over earlier 318 ports. Neither the 308 or 302 are the same as the magnum head exhaust ports though, the magnum exhaust ports were improved again over the 302/308's.
The 302's won't flow as well as the 308's though, because although the shape is similar, the 302's still have 318 sized ports vs 360 sized ports.