At least for quantitative marketing, it's very common to have applicants with different backgrounds. So, I don't think having experience with research related to international finance would be a bad thing. It's good. Even if the topic is different, the approach and methods can be similar. And you can show you have research experience.
But, of course, it helps if you have experience that is closer.
If you are moving from international finance to quantitative marketing, you probably need to think how you will explain that change, and maybe how you might apply the prior knowledge to marketing (e.g., financial impact of marketing investments).
So, it depends on how you position yourself, how you will sell that experience as a good thing for quantitative marketing.