Hi there
I wouldn't do this. What I would do is offer both sets of products under one site with distinctive brand names and markup. That way, your products will appear for their branded searches, with their own pages and rich snippets. I would not "mask" anything or try to trick search engines / users, because that's how you get penalized.
Hopefully I am understanding your question. I would really focus on what Dan Thorton said here...
"If there's no differentiation between the two brands, then there's no point in having them. But if one is targeting a different demographic, then there's a reason to create unique content which will appeal specifically to their audience. The actual product and data may be the same, but the benefit of bespoke content for the right audience will be an increase in conversion rates to actually purchase your services, rather than simply avoiding any SEO penalties..."
You have an opportunity here to have content that's targeted to two different audiences, and increase the overall conversion rate of your website by doing so. I would stick to this route and focus on building great content for each product, pleasing it's target audience.
Let me know if this helps or if you have any questions. Good luck!
Patrick