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We study the two galaxies NGC4621 and NGC4374 in the Virgo cluster to derivetheir distances and stellar population properties. The targets have hostedthree type Ia Supernova events allowing to investigate the correlations betweenthe SNeIa and their host stellar systems. Using deep BVR data, obtained withFORS2 at the VLT, we analyse the Surface Brightness Fluctuations (SBF)properties of the targets. We adopt our measurements and existing calibrationsto estimate the distance of NGC4621 and NGC4374. For stellar populationanalysis, we measured SBF amplitudes in different galaxy regions. We present adetailed comparison between data and models to constrain the characteristics ofthe dominant stellar components at i) various galactic radii, and ii) in theregions where SNeIa were recorded. Our V and R SBF measures provide distancesin agreement with literature estimates. The median of our and literatureSBF-based distances agrees with the one from non-SBF methods. Comparing datawith models we find that stellar populations properties do not changesignificantly along galactic radius, with a dominant population having old ageand solar chemical composition. The galaxies appear similar in all propertiesanalysed, except for B-band SBF. Since the SBF magnitudes in this band aresensitive to the properties of a hot stellar component, we speculate that suchbehaviour is a consequence of different diffuse hot components in the galaxies.We find that the presence of a percentage of hot-HB stars in old and metal richstellar populations could be at the origin of the observed differences. We finda good uniformity in the V and R SBF and integrated colours in the regionswhere the three SNeIa exploded. On the other hand, the B-band SBF signal showsintriguing differences.

VLT Optical BVR observations of two bright Supernova Ia hosts in the Virgo cluster