To answer the O/P's question: No issues in mixing, even if I personally would probably just get another liter of the fluid you have the most of.
Hey guy's, UPSHOT: get over it !! The HPFP is probably German made. What VW owner (on this web site anyway) hasn't heard about the HPFP issue? Decades of design and OEM experiences and STILL can't figure it out ! ?
VW (among many others, MB, BMW, Toyota, GM, Ford, etc, sorry to leave anyone out) has (have) identified the China market as the going forward PREEMINENT market. As such, they will probably build (if they already haven't) both assembly and sub vendor facilities IN and/or around China. So really, the (logistical ) issue will be IF VW China facilities will be used ONLY for the China markets. Or what level of logistical integration will happen with VW's world wide logistical web. Make no mistake, logistical parts and system/s are ESSENTIAL to the brand. Politics (aka, % of parts from what country du jour) I am sure will have more to do with it than any market issues. The US ONLY market Passat, made in the US (Chattanooga, TN) is one example. So therein might be an anomaly VW can/might take advantage. it is well known (or maybe not) the Chinese LOVE US made products. It might be like the last (German made) GOLF (American syndrome).
To wit, years ago when Japanese cars first came to US markets (owned a 1970 VW bought used in 1971), you could not pay me to own a Japanese car, let alone buy Japanese spare parts !! My Daddy at portions in his life had and did vilify ME for not getting American Iron. , partially because he was a WW2 IWO Jima survivor. aka fought WW2 to break German, Japanese and Italian strangleholds. FF to 2015 MY's, it is a RARE Japanese car that does NOT have a better reputation than VW's !! ?? This is not to even acknowledge the PACE of constant improvement has gotten ever faster. Korean brands are starting to match and over take Japanese brands. Indeed, a lot of US market "JAPANESE" cars are more AMERICAN than some American brands (GM,Ford, Chrysler) one would argue that SLOWLY VW's are improving (against still).