Relationship between buy-in, win rate and ROR in NL

[Subman]

I have a choice of the following 3 games :

(i) $200 min/max buy-in, blinds $2-$5
(ii) $100 min, $200 max buy-in, blinds $2-$5
(iii) $100 min, $300 max buy-in, blinds $2-$5

I only play game (i) and have a win rate of X BB per hour.

I realize that there are many factors that make the following questions difficult to answer, yet I would appreciate any replies.

(1) All things being equal, what would be my win rate in game (ii) if I always bought in for $200?

(2) All things being equal, what would be my win rate in game (ii) if I always bought in for $100?

(3) All things being equal, what would be my win rates in game (iii) for buy-ins of $100, $200 and $300 respectively?

(4) For game (i) assume a bankroll of $5,000 and a corresponding risk of ruin (ROR) of, say, R%. All things being equal, can I lower my ROR by playing one of the variations in (1), (2) or (3) above?