I can't think of any major reason why a CR-915 cannot be used where a CR-814 used to live.
As for connectivity, it won't be plug and play. The connectors on the back of the radio will be quite different especially as the CR-814 used a pre-amp (near as I can tell), whereas the CR-915 does not use a pre-amp. That's no great problem, if there's a pre-amp or pre-amp wiring still present you can just bypass it. The other good news is that both radios support an extra pair of dash speakers (wired in parallel with the main front speakers at the radio speaker connector as I recall, but that doesn't matter). As long as you kept the radio connectors off the back of the CR-915, it's just a matter of locating wires and splicing them in.
To aid you, the CR-915 radio connector wiring is documented here in the FAQ at
https://www.brickboard.com/FAQ/700-900/RadioAntenna.htm#CR915Failures
and I found the CR-814 wiring in this old post
https://www.brickboard.com/RWD/volvo/692655/740/760/780/cr814_stereo_wiring.html
You will also have to figure out how much butchering of the wiring was done when the Pioneer was installed. If you're lucky they used an adapter harness, but in any case the wires you need should all still be there somewhere.
As for mounting, more good news. The single radio slot is the same height and the face plate looks identical so I quite imagine the side mounting tabs are also the same meaning the radio mounting tray is also the same (actually I believe all 900s and 700s used the same tray with the exception of the fastener locations attaching them to the center console). When the Pioneer was installed, more than likely the original mounting tray was left in place and an adapter single height DIN mounting box was inserted (such as available from Crutchfield). They're typically just held in by bent metal tabs so should be quite easy to remove to leave you with the original tray. At worst you will need another 940 radio mounting tray if someone decided to butcher up or remove the original one when installing the Pioneer.
I dislike the CR-915's I've had for their poor reliability (three dead, one still barely alive). I've also got no need for cassette capability these days, even though I've probably still got a crate full of old cassettes hiding somewhere. The optional CD player was not at all common and there was only one aftermarket model that was compatible, so don't get your hopes up about ever finding one of those. You can find single and multi-CD players that put an FM signal down the antenna wire -I ditched mine when it became mechanically troublesome. CD capability is rather passe these days anyway. Features I want in radios these days include USB, MP3 and bluetooth connectivity, especially handsfree cellular bluetooth. There are a variety of subscription satellite radio capabilities and other assorted features that I also don't care about at the moment.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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