Green & Orange Ceramic disk capacitors

[CircuitQuest]

Attached are images from a radio I'm trying to fix. I have a simple question. I know blue disk capacitors are for AC or high voltage circuits. Orange I assume is for low voltage, however what are the green one's for?

They are both 22nF btw.
If I were to replace them can I use any low voltage 22nF capacitors?
Like these>> https://m.media-amazon.com/images/I/51tmReuPAlL._SL1001_.jpg

Thanks

[TimFox]

I would not trust those color code assumptions.
Sprague disc ceramic capacitors (now made by Vishay Ceramite) were all orange, regardless of dielectric or voltage rating.
(Sprague liked orange, just like Kermit the Frog liked pigs.)

[Thunderer]

Attached are images from a radio I'm trying to fix.

It would be simpler to say what radio are you fixing (mains supply, battery supply). This way we can guess the voltage level required.

They are both 22nF btw.
If I were to replace them can I use any low voltage 22nF capacitors?

What makes you believe these caps are faulty, so they require replacing? This kind of caps usually outlive us, no reason to replace them unless cracked by mistake.

[floobydust]

The toad green/orange brown ceramic disk caps are reliable and don't just change them out.
Instead- the electrolytic capacitors fail with age - that is the blue and the sea green tubular, grey Shoei in your pics. My practice is to outright change them past past 40 years, they are usually dried out and low value. Radio might motorboat or have weak bass etc.

It better to troubleshoot a bit, if you can say what the radio is doing.
Measuring DCV at IC (don't short probe to the metal strap!) pins can reveal a lot, but we don't know its part number or the radio make/model. That can help too. You can look for the IC datasheet if you don't have the radio schematic diagram.