Interfaceing another PIC? Replacing a existing Digital chip with My PIC

[wdmagic]

I have a circuit board that sends a data stream to a chip, that chip converts the serial stream to LED's
the chip is a A6276ELW see pic of display board. I want to replace this board with a 18F4550 chip that uses a LCD to display the data instead of LED's

http://www.datasheetcatalog.org/data...stems/6276.pdf

First is this possible using a 4550 chip to get the data?
and am I going to need to set up anything on the chip for a specific freq. or anything based on the existing display board?
I am hoping i can just grab the data and not worry with anything else.