In brief
Ornament and spatial organization have different historical connections.
Useful to know
The wooden church in Urnes is an example of a Nordic building tradition from the 12th-XIII century. UNESCO points to a combination of Viking and Celtic art traces with a Romanesque spatial organization. [1]
For observation, separate the detail from the general plan. The carving can point to one tradition, and the way of organizing the interior - to another. This is a more accurate reading than attributing the whole church to one decorative style. Wood is not just a surface material: it is involved in the construction and in the way the individual parts are shaped.
Sources
For further detail and to check the information: