Hi Bob,
Sorry for the delay in my response, we have been in contact with our agents overseas for the most accurate information.
For both destinations, you can change the foreign currency at the hotel reception or a local bureau de change located in a bank, a shopping mall or the airport. Your Tour Manager will also be able to help you find somewhere to exchange your money. The majority of the bureau de changes accept EUR, USD and GBP.
The currency in Malaysia is the Ringgit (RM), often referred to as the Malaysian Dollar. You will not have any problems changing your foreign currency in Borneo, whether this be Euro or Sterling, especially in Kota Kinabalu.
The currency in Singapore is the Singapore Dollar. There are plenty of banks located at Changi International Airport so you can easily change your currencies at the airport if you would prefer. Also, some larger shops accept GBP too.
I hope this helps.
Kindest regards,
Monty