Normally lspci will show you just like this and would suggest they are exactly the same card:

1a:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/580] (rev e7)
1c:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/580] (rev e7)


lspci -vnn is the answer

As we can see one is a Gigabyte and the other is an MSI card.  What's interesting about Linux is that it says what you may not already know bute the RX 470/480/570/580 are essentially the same cards/family.

1a:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/580] [1002:67df] (rev e7) (prog-if 00 [VGA controller])
        Subsystem: Gigabyte Technology Co., Ltd Device [1458:22f1]
        Flags: bus master, fast devsel, latency 0, IRQ 33
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Memory at e0000000 (64-bit, prefetchable) [size=2M]
        I/O ports at 2000 [size=256]
        Memory at e0300000 (32-bit, non-prefetchable) [size=256K]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: amdgpu
        Kernel modules: amdgpu



1c:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/580] [1002:67df] (rev e7) (prog-if 00 [VGA controller])
        Subsystem: Micro-Star International Co., Ltd. [MSI] Device [1462:3418]
        Flags: bus master, fast devsel, latency 0, IRQ 36
        Memory at b0000000 (64-bit, prefetchable) [size=256M]
        Memory at c0000000 (64-bit, prefetchable) [size=2M]
        I/O ports at 1000 [size=256]
        Memory at e0200000 (32-bit, non-prefetchable) [size=256K]
        Expansion ROM at e0260000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: amdgpu
        Kernel modules: amdgpu
 

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