The part CY7C2663KV18 - 450BZI does not contain a DLL. It only has a PLL instead. Both PLL and DLL are used to obtain phase aligned signal with regards to a reference signal. One of the major difference between them is that a PLL extract both frequency and phase of the input signal whereas DLL extracts only the phase. This is due to the the fact that the PLL uses a VCO and DLL does not use them. DLL and PLL may perform the same function - aligning data relative to the reference clock present at the receiver. However, the way the alignment is performed is different. PLL varies frequency, while DLL varies delay.
Ideally you should not connect these two pins to each other, but if you do you may observe some performance issues.
I am planning to connect these two pins, after comparing timing requirements.