"Multi vapor" and "metal halide" are the same bulb. Ditto for frosted or not.
The only 'joker' in the deck is if the fixtures are 'open' fixtures. The newer 'open' fixtures are designed to accept a bulb with a slightly different base. It seems that older-style MH bulbs were quite capable of operating while cracked, allowing for harmful amounts of UV rays to escape. While the 'newer, safer' bulbs will go into any MH fixture, not every fixture will accept the older bulbs.