You have a locked CPU so you can't overclock and there will be no benefit of Z87/Z97 chipset motherboard with it.
Get a H87/H97 chipset motherboard which supports SLI with i7-4770 to save some money.
As for your question Asus Z87-A will be sufficient for overclocking i7-4770k and supports SLI too. The integrated Graphics is in the CPU, so both Z87-A and Z87-Pro will support it.
Other differences between them are:-
Z87-Pro has slightly larger heatsink on capacitors and VRM
Z87-A has 2 PCIe x1 and 2 PCI while Z87-Pro has 4 PCIe x1
Z87-A does not support 3-way Crossfire but both support Quad SLI/Crossfire.
Z87-A has VGA - DVI - HDMI - Mini DisplayPort and Z87-Pro has the same but regular DisplayPort.
Z87-Pro has 2 additional SATA III using ASMedia controller.
Z87-Pro has better audio→Realtek ALC-892(Z87-A) vs Realtek ALC-1150(Z87-Pro)
Z87-Pro has better NIC→Realtek 8111-GR Gigabit(Z87-A) vs Intel® Ethernet Connection I217-V(Z87-Pro)
Z87-Pro has Dual Band Wireless a/b/g/n Adapter