LattePanda 3 Delta Leonardo Arduino Interface Pins

I'm designing a daughterboard PCB to interface with the LattePanda 3 Delta "Arduino" connector pins.  

I cannot find any information confirming what LattePanda pins labeled RXD1 and TXD1 are connected to on the internal ATmega32u4.  Can I assume that RXD1 is routed to pin 20 and TXD1 to pin 21 on the 44-pin package?

Also, is there a LattePanda pin routed to the internal ATmega32u4 pin 8 for SPI select?

Thanks in advance!

Dave