Phono stage question

[Craigis]

Please enlighten me a little hear, always keen to learn.
I have an amp with a built in phono stage, what is the difference between that, and if I connected my TT via (for eg) a Pro-Ject phono stage?
I know there will be a difference if a lashed out and paid R5k+ on phono stage, but will there be a difference on a phono stage that costs below R2k?

 

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