Replacing diseased camellia

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I bought a beautiful camellia about 6 years ago. Pretty early on the leaves started turning yellowish with brown spots and falling off. It's struggled ever since (although clearly had a swan song last spring as the flowers were glorious) and this summer's heat has pretty much seen it off. There are only a few leaves left now and they are brown. I have another camellia nearby and it's really healthy, I don't know what happened to it.

I've been offered a new camellia in a pot. Can I plant it in the same spot as the diseased one or will it also get sick? I'm thinking of leaving it in the pot and digging the pot in for now and maybe planting it in the spring?

What's your soil like? They need acid soil - or a pot of ericaceous compost. Your camellia sounds like my previously unhappy blueberry shrubs in clay soil. Now thriving in pots.

But as you have two - maybe it's a matter of shade/sun? My neighbour's camellia is very happy with only late afternoon sun.

Is the sickly one planted anywhere near any concrete, such as a path or concreted-in fence post? They can't stand alkaline conditions. If it is near a wall, then it could be way too dry - walls suck up moisture from the soil like nobody's business. I suspect the problem lies underground in that particular place, so you need to resolve it before planting another camellia in the same spot.

It's planted near my neighbour's Acer which has doubled in size in that time - so probably taking all the water and it's in shade from late morning. Could that be the problem do you think?

Edited to add that the soil is clay.