SIMs meant to be used in Europe come without special settings, but Bangladesh SIM do come with settings to remove unsupported operators and to set priority for preferred operators in Bangladesh (Gramenphone and Bangalink).
Nothing bad will happen if you interchange the SIMs. You can use European SIMs in Bangladesh and vice versa. The configurations we did on the Bangladesh SIMs are not crucial, it may only make the SIMs connect easier.
It is still possible to restrict the SIMs accessing specific networks. You can do so by configuring the roaming settings in the Advanced Console. For more information, see our documentation.
Hope this clarifies. Feel free to get back to us if you have any further questions.