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Head to head · Prices checked Oct 21, 2026

Redragon CASTOR K631 Pro vs Xinmeng M75 Pro

Get the Xinmeng M75 Pro for the 5,000 mAh battery and knob.

What actually differs

The differences that matter

Skip the 40-row spec sheet. These are the specs that change how each board feels, sounds, and fits your desk.

Redragon CASTOR K631 Pro

Xinmeng M75 Pro

  • Layout size

    65%

    75%

  • Battery

    1,600 mAh

    5,000 mAh

  • Switch options

    Linear

    Linear, Silent

  • Mount style

    Bottom Mount

    Gasket Mount

  • Knob

    No

    Yes

KeebFinder scores

How we score
  • Redragon CASTOR K631 Pro
  • Xinmeng M75 Pro
Performance
72
82
Build quality
57
75
Productivity
54
81
Customizability
58
79
Portability
85
80

What they share

  • Connection: Bluetooth, 2.4 GHz, Wired
  • Hot-swappable
  • Case material: Plastic
See every spec side by side

Full specs

Redragon CASTOR K631 Pro vs Xinmeng M75 Pro specs

Every tracked spec, side by side. Rows marked with a dot differ between the boards.

13 of 21 specs differ

Redragon CASTOR K631 Pro

Xinmeng M75 Pro

Typing & switches

Switch options

Linear
Linear, Silent

Hot-swappable

Yes
Yes

Mount style

Bottom Mount
Gasket Mount

Sound dampening

No
Yes

Layout

Layout size

65%
75%

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Knob

No
Yes

Display

None
TFT

Connectivity & battery

Connection

Bluetooth, 2.4 GHz, Wired
Bluetooth, 2.4 GHz, Wired

Max polling rate

—
1,000 Hz

Battery

1,600 mAh
5,000 mAhBetter

USB-C

Yes
No

Build & materials

Case material

Plastic
Plastic

Keycaps

ABS
PBT

Weight

470 g
900 g

Dimensions

40 x 309 x 104 mm
20 x 326 x 152 mm

Backlight

RGB
RGB

Firmware & software

N-key rollover

Yes
Yes

Mac & Windows

No
Yes

Extras

Released

2026
2024

Where to buy

Compare prices

Live prices from the stores we track, cheapest in-stock offer first.

Lowest price across stores, Amazon excluded.

  • RedragonCN

    In stock
    $42Visit
  • AmazonGlobal

    Check price
    ~$42Visit
  • VelocifireCN

    In stock
    $49Visit
  • AmazonGlobal

    Check price
    ~$49Visit

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