ISC DHCP multiple simultaneous subnets

I'm helping a small ISP and I've run into a problem I've never had to solve before. This ISP had a single /23 of the public IP address. They have exhausted their pool of addresses and have acquired a new /24 of public addresses. The subnets are not contiguous. They need their customers to get an IP via DHCP from either subnet, via an ISC DHCP server running on Centos 7.

Will something like this work? Will clients get IPs from both pools for a total of around 768 addresses?

shared-network CMTSSide {# subnet pool A for CPEsubnet 50.169.42.0 netmask 255.255.254.0 {range 50.169.42.5 50.169.43.254;option routers 50.169.42.1;allow unknown-clients;}

# subnet pool B for the CPEsubnet 68.231.221.0 netmask 255.255.255.0 {range 68.231.221.5 68.231.221.254;option routers 68.231.221.1;allow unknown-clients;}}