Name change on passport without updating PR card?

[danhass]

I plan to change my name slightly. My current name has 3 words (first, middle, last):

Aaaaa Bbbbb Ccccc

This is on both my passport and my PR card.

I plan to remove my lastname and change my middle name to lastname:

Aaaaa Bbbbb

I'll get a new passport with my new name, but I don't want to update my PR Card immediately (becaus PR Card processing is slow and I need to travel).

My question is: Is it required that my PR Card have the exact name as my passport when I travel in and out of Canada? I'll keep my name-change certificate all the time with me, wouldn't that be enough?

Secondly, if I really have to apply for a new PR Card, would I keep my old PR Card and travel with it while my new card is processed?