May 19 (Reuters) - KKR said on Monday it

believed its offer for British healthcare property investor

Assura represented a "superior" proposal after rival

suitor Primary Health Properties ( PHPRF ) outbid the U.S. private

equity firm last week.

Assura said on Friday it was reviewing the new

cash-and-stock offer from Primary Health Properties ( PHPRF ), which came

in 4.7% higher than the KKR-Stonepeak all-cash bid.

The KKR-Stonepeak offer currently has the backing of the

Assura board.

($1 = 0.7517 pounds)

(Reporting by Yadarisa Shabong in Bengaluru; Editing by Mrigank

Dhaniwala)