It will remain the same i.e. if pig and horse are available in life saving situation, you'd go for horse meat. Additionally if insulin obtained from horse is available, insulin obtained from pigs should be removed from market to save unnecessary killing of pigs.
Jaidi bat kuch kuch theak lagti hy par poori hazam nai ho rai ..... Horse is more useful animal than a pig (for Muslims) so that utility won't play any role in determining which one should be above the other in ranking, in list of animals permitted to be consumed in dire situations?