I don't know. However, I don't think you will find any resistance to flow, even if there is some kind of thermostat.
I have a thermostat for my oil cooler, and the way it is set up it has both passages open when the oil is cold. As the oil warms up it then closes the bypass passage, forcing (almost) all the oil through the cooler.
I recently learned that Ford has a bypass thermostat on the transmission lines of some of their trucks. When the ATF temp is low this thermostat opens up, allowing fluid to bypass the factory cooler. All this really does is provide an alternate path for fluid flow, it doesn't block flow through the cooler.

BTW, I know B&M has stacked plate coolers that they claim to have some kind of ability to modulate the flow based on temps. (I haven't read the description in quite a while, so bear with me on that.) I think all those coolers have is a narrow passage leading to the plates after the first two. As the fluid warms up it gets thinner, allowing it to flow past this restriction and into the rest of the passages.