indeed, but not all countries are on equal footing and there's where the difference comes in:
let's take the us. the us has enjoyed a long period of dominant position (for several reasons), and on trade agreements with less developed countries have used that as leverage for profit. part of the eu, specially the uk and north europe, much of the same but lately to lesser extent. this is mostly the case when what the partners have to offer is basically natural resources. if you only maximize your current profits, you make sure that your investment in those countries imposes strict conditions, ensures a steady resource flow for years to come, and doesn't benefit the other part too much, so that you keep the leverage, ideally forever. this is in essence a modern version of the colonial model. it is not really based on mutual benefit, and is not really fair trade.
china otoh is just entering a period of dominant position, and has been expanding its influence all over the planet for a while, very much so in developing countries, eg. africa. they ofc seek profit too, and are also primarily after natural resources, but they offer better deals and and give them agency, allowing their investment to actually improve those countries' development. it's a longer term strategy that forfeits a little of the immediate profit in favor of being fairer, fostering good relations and general exchange, and the expectation of the country becoming a more solid partner in the future that has much more to offer than mere resources, for one becoming a profitable market of chinese products, but not only. this is based on mutual benefit, and the whole brics initiative operates on this premise.
one could argue that china's different approach is a factor of their status as an emergent power. maybe as they become more and more dominant this will change. maybe it's just their philosophy and their vision of a future multipolar world. i guess we'll find out.