Campagnolo cabling: can I use other non-Campagnolo brands? The obvious reason why, is cost!

I need my front derailuer's cable to be replaced and I'd like to simply buy some raw brake cable from the bike shop and simply re-insert into my existing campy cable guides. Can that be done, or do I have to buy Campagnolo cables? Is there a cable guide or some PDF that has more technical details specific to Campagnolo cables?

I have Athena 11sp with 11sp Campagnolo Record shifters - not EPS.

Thanks
You don't have to buy Campy brand cables, but you do have to buy Campy-compatible cables, because they use a head that's a little bit smaller for both shift and brake cables. If you ignore this, it can seem like it's fine, but get stuck in your lever. The alternative in a pinch is taking a little off with a grinder or file.

Most shops will have individual carded Campy-compatible cables that are more expensive than bulk but not nearly as much as Campy. Some shops have them in bulk. There is no compatibility issue with using them in your Campy housings.