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If the company gives you a set amount for your travel expenses or for your stay in the hotel, and it leaves you to spend it as you want, and does not ask you for bills to show how you spend it, then this money is your property and you can do with it whatever you wish.
But if the company gives it to you so that you can take from it your actual costs, then it is not yours in an absolute sense; rather it is yours to use for a purpose, and you are like a trustee; it is not permissible for you to take anything from it except the amount that you have spent. So if one night in the hotel costs you 191 euros, you do not have the right to record it as 213 euros.
Whatever you get of profits or reductions in the exchange rate, or gifts from the hotel, or anything else, you must inform the company of it. That is because you are an agent who is trusted with the company’s money, and any profits or gains made by the agent belong to the party who appointed him.
Al-‘Allaamah Muhammad Mawlood al-Mauritaani said in Nazm al-Kafaaf:
If there is any increase, it goes to the one who appointed the agent; it does not go to the agent who has not been fair.
See also the answers to questions no. 177706 and 147027.
And Allah knows best.