I also have 2 passports from the same country…
I often have problem to swap the passports though-especially when coming to Thailand they always want to see my Malaysian stamp which confirms I left malaysia…. So I show them my first passport with my Malay visa but ask them to use the second for the Thai visa- and so far they always disagreed and I needed to wait a long time before they accepted the fact that im possesing 2 valid passports.
Saying this, I think it’s easier when flying ..probably because the immigration officers at the airports have seen more people like me.
I have the same issue, different country and travel to China frequently. I just hand them both passports. There has never been a problem. The first time I flew to Hong Kong and then crossed into Shenzhen, the border lady told me it is common. Ps. It can cause problems to enter on one and exit on another. They know when and where you enter and exit. True for Vietnam too.
While I haven’t been in the exact same situation, I have two German passports as well and I have been travelling in Asia for the last few years using both of them.
Pretty much always, use the same passport to exit a country that you have used to enter it. Using the second passport when arriving in the next country should be fine. If they really want to see prove of your stay in the previous country you can show them your second passport.
In some(many) countries it is illegal for locals to own two passports of their country, so immigration officers may be confused, but you can tell them that is is perfectly legal in Germany.
If you plan to apply for a third country visa in a foreign country, you may have to use the same passport that you used to enter that country, example is applying for a Chinese visa in Hong Kong.
In general keep your second passport away from the immigration office. When entering Turkmenistan from Iran, I handed in both passports because one had my Iranian exit stamp and the other one my Turkmen visa. The border guards were completely confused because they didn’t realised both passports belong to the same person and complained about the missing Turkmen visa in the first passport, I just explained to them, they are both mine and all was fine.
One of the reasons why you can have two passports in Germany is to allow you to get many visas in a short period by sending them off to embassies in parallel, so you may end up with some visas in one passport and other visas in the other one. In my experience it was perfectly fine to ‘switch’ passports between border gates (or on the plane)
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