Can I add a port yeast to my fermenting wine?

[MountainRunner]

Hi
I'm new to wine making. So I am making some Loganberry and blackcurrant wine. I used a general universal wine yeast and added it to the must in a fermentation bucket.

I wished I'd use a port yeast or red wine yeast. Can I add this yeast later despite having started the wine with universal wine yeast?

Or should I just go in faith and hope that universal wine yeast is good enough for loganberry/blackcurrant wine?

Does universal wine yeast give a reasonably good alcohol content like over 13.5%?

 

[wineforfun]

What is "universal wine yeast"?

What brand, ie: Red Star, Lalvin, etc.?
What type within the brand, ie: Montrachet, Pasteur Red, EC-1118, etc.?

 

[sour_grapes]

I am thinking it must be Gervin's: http://www.muntonshomebrew.com/other-products/gervin-yeast/