E. carinata is absolutely different species. If you want know exact taxonomical status of Z. carinatus you must visit www.reptile-database.com.
Ok, i understand about my longissima. I fear that i can't help you because i'm not european, but russian and it is impossible for me - send animals is other country. Sorry, i can help only by advice about it's ecology or reproductive biology.
About E. quatourlineata - i have several specimen with orange background color.
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Ivan Arinin
ICQ 151665951
E.g. guttata Normal 2.3
E.g. guttata Albino 2.4
E.g. guttata Oketee 2.0
E.g. guttata Hypo Oketee 1.1
E.g. guttata Albino Okeetee 2.2
E.g. guttata Ghost 2.3
E.g. guttata Motley 2.2
E.g. guttata Albino Motley 2.2
E.g. guttata Anerythristic 2.2
E.g. guttata Snow 2.4
E.g. guttata Creamsicle 2.1
E.g. rosacea 2.2
E.g. emoryi 2.2
E. persica black 3.4
E. persica brown 2.1
E. longissima 4.6
E. situla 3.3
E. dione 54
E. bimaculata 4.3
E. quatourlineata 10.15
E. o. obsoleta yellow 2.2
E. o. lindheimeri White Sided 2.2.
E. o. lindheomeri Leucistic 1.2
E. o. lindheimeri Black Orange 2.2
E. o. quatourlineata 1.3
E. o. quatourlineata Deckerti 2.2
E. o. quatourlineata Williamsi 1.0
E. o. rossalleni 2.2
Langaha madagascariensis 2.1.12
Cylindrophis ruffus 0.1
Enhydris plumbea 1.0