Pretty much, yes any correctly wired valve.
HT isn't critical actually, as long as you increase or decrease Anode resistor.
The bias may need adjusted with a different valve. The data sheet will show. But likely not critical.
It's really a two valve radio though!
A pair of 70c Russian Rod Pentodes will even work in Triode circuits at low voltage HT if you tie G2 and G3 to Anode. A 1j24b takes 12mA @ 1.3V filament. At 9V to 22V HT I've used the 1j18b as a triode by ignoring or earthing Anode and using G2 as the Anode.
My Hergé radio is really a one valve radio with a 3 valve audio amp added:)
An ECC82 will work.
None of these designs are very critical. The most you need to do is change value of cathode (bias) and/or anode (gain/load) resistors to improve performance.
Have you a link to the schematic?