The X4 Pro 5G packs a 108 MP camera, quite an upgrade over the X3 Pro. The M4 Pro is a 4G version of the M4 Pro 5G from last year.
POCO announces (relatively) affordable X4 Pro 5G and M4 Pro smartphones with 108MP, 64MP cameras: Digital Photography Review
Official: the announcement of POCO X4 Pro 5G and POCO M4 Pro 4G will be presented on February 28
Poco X4 Pro 5G enters Indian market with 120Hz display, 67W fast charging; Know more - Smartprix
POCO M4 Pro vs POCO X4 Pro 5G: Specs Comparison - Gizmochina
POCO announces (relatively) affordable X4 Pro 5G and M4 Pro smartphones with 108MP, 64MP cameras: Digital Photography Review
POCO M4 Pro 4G teased by the company ahead of launch
Poco X4 Pro 5G and Poco M4 Pro announced, both with AMOLED displays - news
POCO X4 Pro 5G And POCO M4 Pro Announced From RM899 — Here's All You Need To Know About POCO's Latest Mid-rangers! –
Poco M4 Pro 5G Review with Pros and Cons - Smartprix
Poco expands its family with launch of X4 Pro 5G and M4 Pro
Poco M4 Pro in for review - news
Poco M4 Pro 5G With MediaTek Dimensity 810 SoC, 90Hz Display Launched in India: Price, Specifications
Poco M4 Pro and X4 Pro 5G unveiled: mid-rangers face-to-face