"mostly match" is correct and can be used in written English.
It means that something is largely or generally the same as something else. Example: "Their interests mostly match, but there are a few differences between them."
The Kent police were mostly "match fit", Mr Collins added, but suffered from some weak local commanders "who would rather make offences go away than investigate them".
The places with the smallest temperature gradient also seem to be where the jet stream meanders most.A set of observations that mostly match what a sensible-sounding theory predicts may seem a strong case.
It indicates that generally, the measured hydrodynamic pressures mostly match well with those calculated by the Westergaard's formula.
Target (details) and Walmart (details) will mostly match these prices, they are no better than Amazon's prices.
But DDR&E is said to be willing to mostly match DARPA's $1.5-million-a-year 1.5-million-a-year 1.5-million-a-year 1.5-million-a-year conduit through which Jason's other clients, including the Department of Energy and the intelligence community, can funnel money and requests for studies.
If I'm honest about my own reading material as a 13-year-old – mostly Match and Shoot football annuals – it's hard to argue a huge amount has changed.
In the first half, with Revis mostly matched up on him, Moss caught just two passes.
His hitting mostly matched up with previous seasons in terms of performance.
The food mostly matches the monochrome décor, but from start to finish is full of vivid flavours.
Observed chromatographic results on the optimal condition mostly matched with the prediction and the average of difference between observed and predicted resolution were approximately 0.3.
The simulations with failure prediction mostly matched the experiment very well except for the ones under temperature of 200 °C and 400 °C with quasi static loading.
