Frame relay encapsulation

So, I read that frame relays have 2 encapsulation options, cisco or ietf. I tried that in the lab with packet tracer, with just a simple single pvc with no subinterfaces. Here are the configs

R1
interface serial 0/0
no shut
encapsulation frame-relay
ip address 10.255.255.1 255.255.255.252

R2
interface serial 0/0
no shut
encapsulation frame-relay ietf
ip address 10.255.255.2 255.255.255.252

I expected the ping to fail, but it succeeded. Is it normal?

EDIT: Sorry, never mind, I should have read the frame relay troubleshooting part more carefully. The ping is supposed to work even with different encaps because both are Cisco routers.