Outer Limits 4x4 Board

This is the first time I have serviced the gu td42t, have paid to get it done in the past but I thought I should give it ago myself.
Anyway I have drained the engine oil and taken off the oil filters, so far so good but when I looked at the 2 NEW filters I discovered they are both the same and the OLD ones are 2 different ones.
Part no's are old ones,
front one Z416
Rear one Z503

new ones both Z503

Is it ok to use both the new Z503's
Or should I wait and get a new Z416?

Any answers greatly appreciated.
Cheers

they are different for a reason..
Just get the right one in the morning from Kmart.

Yeah thanks thats what i will do.
Oh well at least i have one for the next oil change.
cheers

Both filters use a diffferent thread to each other.
The Z416 has an inbuilt pressure relief valve.
The Z503 doe's not.
You can use a Z9 (common Ford filter) instead of the Z503.
Alot cheaper and only slightly longer.

Al.