Si t'arrives à qqchose avec ça : (
http://www.kleinevlinders.nl)
Forewing with distance (at 
dorsum) between 
base and first pale 
transverse line about equal to distance between both 
transverse lines =
Ephestia unicolorella
13.0-20.0mm. June to September (in Britain). Forewing grey, somewhat yellowish, sometimes suffused reddish on 
base of 
dorsum and on termen; 
transverse lines distinctly edged dark: first line distally, second in particular inwardly; two transversely placed dark discal spots. 
 
Forewing with distance (at 
dorsum) between 
base and first pale 
transverse line shorter than the distance between both lines
E. elutella
11.5-18.5mm. Late May to early October with peak emergence from June to August (outdoors). Forewing brownish grey, sometimes suffused reddish in dorsal area. Melanistic forms occur. First pale 
transverse line distinctly edged blackish grey outwardly, inwardly edged faintly, second line edged at both sides, edging of both lines sometimes less distinct; two transversely placed dark discal spots, often indistinct.