Hardness results on different scales should not be treated as directly interchangeable unless a suitable, documented conversion basis applies.
The short answer
No, not merely because both results are called hardness. A reported value belongs to a particular scale and test method. Different scales can use different indenters, forces, procedures, specimen requirements, and result definitions. The number alone therefore has no universal meaning outside the conditions that produced it. A larger numeral on one scale does not necessarily indicate greater hardness than a smaller numeral on another.
When conversion may be defensible
A cross-scale comparison needs a recognized conversion basis that is applicable to the material, hardness region, specimen condition, and methods involved. The conversion source and its limitations should accompany the converted value. Conversion is generally an estimate rather than a new direct measurement, so the original scale and result should remain visible. NIST Technical Note 1297 provides the broader measurement principle that uncertainty must be evaluated and expressed; a converted result should not be presented with precision or certainty unsupported by its conversion basis.
How to read a report
First identify the scale, method, specimen state, measurement location, and original reading. Then check whether the cited conversion reference covers that material and test situation. If those conditions are absent, compare only results reported on the same scale under sufficiently comparable methods. Do not create an advertising value by applying an undocumented chart or an assumed numerical relationship.
Publication boundary
For any product claim, the safest record is the verified result exactly as reported. A converted figure should be labeled as converted, linked to its source result, and accompanied by the applicable conversion authority. Where a report supplies neither a valid conversion nor the information needed to assess applicability, retain the original result and leave cross-scale equivalence unstated.