I would say that both are complimentary terms in this context, and mean relaxed and easy-going. Both describe a person who doesn't worry too much or let things bother them unnecessarily. Examples:
I'm chilled out about what we do today, so we can either stay in or go out.
My parents are laidback about me having a party, even if lots of people come.
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April 28, 2020
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Yes, it's fine as it is. The first sentence is a little formal, so as an alternative you could say: 'You weren't like this when you were first here.'
The first sentence also suggests that 'here' is somewhere in particular and that the place matters. If the meaning is more that the person has changed generally over time, you could also simply say: 'You weren't like this at first.'