Two basketball sites can show different numbers for the same game. This is usually not an error, but a consequence of how the data is collected and defined.
Why sources disagree
Some figures, such as points and rebounds, are straightforward. Others, such as assists, turnovers, blocks or shot locations, involve judgement by scorers. Advanced measures like estimated possessions or player impact rely on formulas that differ between providers.
Keeping things consistent
Pick one or two sources and stay with them across the season. Consistency matters more than finding a perfect provider, because trends are easier to read when the method does not change.
The PLANBET Canada website is a reasonable example to study when looking at how a platform explains where its numbers come from. A short note on methodology is a good sign.
Check also when the data was last updated. Stat lines are sometimes corrected after the game, so a figure seen at the buzzer may change by the next day. When betting markets are something you follow, never rely on a single source and never treat a number as a certainty. Keep to a set budget, a time limit and a modest stake.
Rounding and timing create small differences too. One source may show a percentage to one decimal place and another to none, and one may update after every possession while another waits for the end of the quarter. These gaps are cosmetic, but they can look like disagreement when you are comparing quickly. Taking a moment to check the update time and the definition solves most apparent conflicts, and leaves only the real ones worth investigating. Some providers publish the formula behind advanced metrics, and some do not. Prefer the ones that do, because you can then judge whether the method suits the question you are asking. A short description of the inputs and how they are weighted makes comparison much easier, and a metric with no explanation at all is best treated as an opinion rather than a measurement.
Comparing sources will not give a perfect answer. It will give you a better sense of how much uncertainty sits behind each figure.