can anyone comment on having merged their Vegas MLife and Borgata MLife accounts?

i have reservations upcoming for both vegas and borgata... my vegas card is hardly used and i have much fewer TC on it... it was a matched card from Hyatt Platinum so it is Gold, but only until 9/30/2017.

My Borgata card is also Gold but was given the intro offer of not expiring until 9/2018... so I'd like to make the Borgata number my main account and move everything (TC and reservations) from the vegas card over to the borgata #.

has anyone done a merger and can comment on what happens? i don't go to vegas enough to justify keeping 2 accounts, even if there may be some hidden benefits.