Any person receiving or entitled to receive a pension or any other benefit, or who will become entitled to receive a pension or any other benefit, from the Kansas bureau of investigation pension fund as it existed on the day preceding the effective date of this act shall be entitled to receive from the Kansas police and firemen's retirement system such pension or any other benefit to the same extent and subject to the same conditions as existed on said day.
K.S.A. 74-4986b