Fleetside bed front panel differences?

[Bloodhound]

I am replacing the front bed panel in my fleetside bed. I bought this bed several years ago and knew it would need this, finally using it. I don't know what year the bed is, but I believe it to be at least an '81, and I vaguely remember being told it is an '85. While looking up a replacement front panel, the year breakdown for them everywhere is 1973-84 and then 1985-87. Anyone know what the differences might be?

For example - 1973-84

https://www.cjponyparts.com/bed-pane...4aAtpAEALw_wcB

1985-87

https://www.classicparts.com/1985-87...nfo/09%2D057B/

Also from LMC